Cap wrench



NOV. .7, 1933. c w DRAPER 1,934,118

CAP WRENCH Filed Jan. 25, 1932 INVENTOR [A Ciastarifirapar W Maw/6M k.)U ATTORNELS Patented Nov. 7, 1933 x UNITED STATES PATENT OFFICE.

GAP WRENCH Chester W. Draper, Detroit, Mich.

Application January 25,

4 Claims.

The invention relates to'wrenches more particularly designed for use intightening or removing the screw caps of jars. It is the object I of theinvention to obtain a construction which as hereinafter set forth.

In the drawing:

Figure 1 is a perspective view of my improved wrench;

Figure 2 is a bottom plan view thereof.

A is a jaw member, preferably a sheet metal stamping provided with asegmental edge B for fitting about the cap. C and C are lever members,also preferably sheet metal stampings, said levers being secured to thejaw member A by the pivots D. Each lever member comprises a handleportion E, an outwardly extending bell crank arm F and an inwardlyextending bell crank arm G. One of the arms G is bifurcated at H toembrace a rounded end H of the other arm so that a movement of one ofthe levers relative to the jaw member A will impart an opposite movementto the other lever. I is a segmental band, preferably formed of wire andforming a complement to the jaw member A. The opposite end portions ofthis band pass adjacent to the side edges of the jaw member A and haveat their ends hooks J which engage apertures in the bell crank arms F.The jaw member A has projecting outward therefrom thumb pieces K whichenable the operator grasping one of the handles E to move the samerelative to the jaw member so as to expand the diameter of the segmentI.

With the construction as described, to apply the wrench to a cap theoperator grasps one handle and by pressing his thumb upon the member Kcan swing both handles outward. In so doing, the band I will be drawn inlaterally due to the angular movement of the bell crank arms F and thisband has suflicient resiliency to return the parts to normal positionwhen the pressure of the thumb is released. Thus after the operator hasengaged the band with the cap upon releasing pressure of the thumb thetwo handles will close together in a position to be grasped in the onehand. The operator then presses these handles together which willproduce a movement in the opposite direction in the member A and theband I, thereby tightening the grip upon the cover to clamp the same. Byreason of the favorable leverage suflicient clamping pressure is de-1932. Serial No. 588,767

veloped without great exertion upon the part of the operator, who canthen readily either screw or unscrew the cap.

As the members A, C andC' are sheet metal stampings, and the member I isformed of wire,

the cost of manufacture is relatively low.

What I claim as my invention is:

1. A cap wrench comprising a segmental jaw member, a pair of leverspivoted thereto and interconnected to swing in opposite directions, a

band member complementary to said segmental jaw and having its endsconnected to said levers, and a thumb piece on said jaw member for thepurpose described. 1

2. A cap wrench comprising a pair of lever members and a segmental jawmember, all formed of sheet metal stampings, said lever members beingpivotally secured to said jaw member and being each provided withoutwardly and inwardly extending bell crank arms, the inwardly extendingbell crank arms pivotally engaging each other, and a band. complementaryto said jaw member having its ends pivotally. attached to the outwardlyextending bell crank arms.

3. A cap wrench comprising a segmental jaw member, a pair of levermembers pivotally attached thereto, each of said lever members having ahandle portion and outwardly and inwardly extending bell crank arms,said inwardly extending bell crank arms having a pivotal engagement witheach other, a wire band complementary to said jaw member having hookedends engaging the outwardly extending bell crank arms of said levers,and thumb pieces on said jaw member for the purpose described.

4. A cap wrench comprising a segmental jaw member, a pair of leverspivoted thereto, a substantially U-shaped band having its ends connectedto said levers, a thumb piece on said jaw member by means of which onelever may be moved outward, the resiliency of said band returning thesame to its normal position and an interconnection between said leversto cause the same to move outward and inward simultaneously.

. CHESTER W. DRAPER.

